Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus
US4150262A · kind A · utility
361Cited by
7References
5Claims
0Family size
Inventor
Key dates
| Filing date | Apr 21, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Apr 21, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A voice sound transmitting and receiving apparatus suitable for the use under noisy circumstances and designed to be inserted into the external auditory canal of a user for attaining the voice sound transmitting and receiving operation using the vibrations of the external auditory canal wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.